09-15-2011
Actually the script is fired every time a file is arrived. This is done through an external application. This featured cannot be disabled since its used by some other applications too.
So the idea is even though the script is fired every time a file is arrived, I wanted to check if 30 minutes has passed from the first file arrival time and then do the existing logic.
Thanks
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LEARN ABOUT REDHAT
pvmfnrecv
NRECV(3PVM) PVM Version 3.4 NRECV(3PVM)
NAME
pvm_nrecv - Non-blocking receive.
SYNOPSIS
C int bufid = pvm_nrecv( int tid, int msgtag )
Fortran call pvmfnrecv( tid, msgtag, bufid )
PARAMETERS
tid Integer task identifier of sending process supplied by the user.
msgtag Integer message tag supplied by the user. msgtag should be >= 0.
bufid Integer returning the value of the new active receive buffer identifier. Values less than zero indicate an error.
DESCRIPTION
The routine pvm_nrecv checks to see if a message with label msgtag has arrived from tid. and also clears the current receive buffer if
any, If a matching message has arrived pvm_nrecv immediately places the message in a new active receive buffer, and returns the buffer
identifier in bufid.
If the requested message has not arrived, then pvm_nrecv immediately returns with a 0 in bufid. If some error occurs bufid will be < 0.
A -1 in msgtag or tid matches anything. This allows the user the following options. If tid = -1 and msgtag is defined by the user, then
pvm_nrecv will accept a message from any process which has a matching msgtag. If msgtag = -1 and tid is defined by the user, then
pvm_nrecv will accept any message that is sent from process tid. If tid = -1 and msgtag = -1, then pvm_nrecv will accept any message from
any process.
The PVM model guarantees the following about message order. If task 1 sends message A to task 2, then task 1 sends message B to task 2,
message A will arrive at task 2 before message B. Moreover, if both messages arrive before task 2 does a receive, then a wildcard receive
will always return message A.
pvm_nrecv is non-blocking in the sense that the routine always returns immediately either with the message or with the information that the
message has not arrived at the local pvmd yet. pvm_nrecv can be called multiple times to check if a given message has arrived yet. In
addition the blocking receive pvm_recv can be called for the same message if the application runs out of work it could do before the data
arrives.
If pvm_nrecv returns with the message, then the data in the message can be unpacked into the user's memory using the unpack routines.
EXAMPLES
C:
tid = pvm_parent();
msgtag = 4 ;
arrived = pvm_nrecv( tid, msgtag );
if ( arrived > 0)
info = pvm_upkint( tid_array, 10, 1 );
else
/* go do other computing */
Fortran:
CALL PVMFNRECV( -1, 4, ARRIVED )
IF ( ARRIVED .gt. 0 ) THEN
CALL PVMFUNPACK( INTEGER4, TIDS, 25, 1, INFO )
CALL PVMFUNPACK( REAL8, MATRIX, 100, 100, INFO )
ELSE
* GO DO USEFUL WORK
ENDIF
ERRORS
These error conditions can be returned by pvm_nrecv.
PvmBadParam
giving an invalid tid value or msgtag.
PvmSysErr
pvmd not responding.
SEE ALSO
pvm_bufinfo(3PVM), pvm_getminfo(3PVM), pvm_recv(3PVM), pvm_unpack(3PVM), pvm_send(3PVM), pvm_mcast(3PVM)
30 August, 1993 NRECV(3PVM)